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235 CE - 284 CE: The Crisis of the Third Century in Rome; period of the Barracks Emperors.
235 CE - 238 CE: Reign of Roman Emperor Maximinus Thrax.
235 CE: Assassination of Alexander Severus and his mother, which begins crisis and period of Barracks Emperors.
238 CE - 244 CE: Reign of Gordian III in Rome.
238 CE: Reign of Gordian I and Gordian II in Rome.
238 CE: Reign of Balbinus and Pupienus in Rome.
244 CE - 249 CE: Reign of Philip the Arab in Rome.
249 CE - 251 CE: Reign of Decius in Rome.
251 CE: Reign of Hostilian in Rome.
251 CE - 253 CE: Reign of Gallus in Rome.
253 CE - 260 CE: Reign of Roman emperor Valerian with his son Gallienus as co-emperor.
253 CE: Reign of Aemilianus in Rome.
253 CE - 268 CE: Reign of Gallienus in Rome.
260 CE - 269 CE: Postumus rules the "breakaway" Gallic Empire.
268 CE - 270 CE: Reign of Claudius Gothicus in Rome.
270 CE - 272 CE: Zenobia rules the "breakaway" Palmyrene Empire.
270 CE - 275 CE: Reign of Roman emperor Aurelian.
271 CE - 274 CE: Tetricus I rules the Gallic Empire until defeated by Aurelian.
275 CE - 276 CE: Reign of Tacitus in Rome.
276 CE: Reign of Florianus in Rome.
276 CE - 282 CE: Reign of Probus in Rome.
282 CE - 283 CE: Reign of Carus in Rome.
283 CE - 285 CE: Reign of Numerian and Carinus in Rome.
284 CE - 305 CE: Reign of Diocletian who resolves the Crisis of the Third Century and eventually divides the Roman Empire for easier management.